20 October 2016 - 1st class deep scarlet Machin definitive from retail booklet of 6, source code MSIL.
The new booklet with a Padlock design on the cover was issued on 28 July 2016. A second version was issued on 20 October with a new (Chevin) font and with the stamps and parts of the cover printed in darker red.
SG number U2968da
§ Please note we have changed the number from 2936S.6a to 2936aS.6 - the basic sheet stamp is a new colour and therefore has the suffix 'a' (2937 is already in use); this booklet stamp is 2936aS, with suffix .6 (2936aS.6)for M16L printing (and 2936aS.7 for M17L printing etc).